fischertechnik pneumatic mini air compressor

thingiverse

This is a custom enclosure for a low-cost mini pump, making it compatible with the pneumatic program of the Fischertechnik construction toy system. As the pump requires 3V input, a small step-down converter is included in the design to allow using the standard Fischertechnik 9V (or anything between 6V and 23V). In my tests, the pump provided up to approximately .7 bar at approximately 3.5V input. Due to its size, it's quite slow, though, and not suitable for heavy-duty applications. Apart from this enclosure, you'll need: 1. Mini air pump, for example from eBay. You can find them by searching for "Transparent Mini Air Pump" on the website and comparing the results with my pictures. 2. Step-down converter. Find this by searching for "Mini DC-DC Converter Step Down Module Adjustable" on the website and watch out for similar looking designs. Look for the smallest type with "DSN-Mini 360" on its backside. 3. 1A Schottky diode, if you want to protect the converter against reversed polarity (highly recommended). I used a BYS21-45 diode that I had lying around. I'm sure there are better types, but I'm no expert on this, so if you have a better recommendation, please leave a comment. 4. 4mm brass rod, 2.4mm high quality metal drill, and drilling aid from my N20 mini power motor design for the two connectors (see there in the Post Printing section for instructions). 5. Soldering iron and short pieces of wire. 6. Super glue to seal the enclosure permanently. Related thread at the Fischertechnik forum: https://forum.ftcommunity.de/viewtopic.php?f=15&t=4821 https://youtu.be/Q3HNsLEe3_o Find my other Fischertechnik designs here: https://www.thingiverse.com/juh/designs